function rad(d) {
	return d * Math.PI / 180.0; 
}
export default {
	getDistance: function (lat1, lng1, lat2, lng2) {
	
	    var radLat1 = rad(lat1);
	    var radLat2 = rad(lat2);
	    var a = radLat1 - radLat2;
	    var b = rad(lng1) - rad(lng2);
	    var s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2) +
	        Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2)));
	    s = s * 6378.137; // EARTH_RADIUS;
	    s = Math.round(s * 10000) / 10000; 
	    return s * 1000;
	}
}